Bbake-shoe



FV?. E. @i2 FRANCE.

i BRA-KE SHOE. APPLlcAnma HLED IAN.I0.I91G.

Patented May 6,1919.,

UNITED l.SITATES PATENT OFFICE.

MUBBELL 3.1m runnen, or BELLEVUE, rnNnsYLvANIA.

BMK-Essor To all whom t may concern:

I MURRnnL R. DE

Be it known that y FRANCE, a citizen of the nited States, and a residentof Bellevue, in the county of Allegheny and Stateof Pennsylvania, havemade 'a new and useful Invention in Brake-Shoes,

of which the following isa specification. This invention relates tobrake shoes. It is now customary to manufacture brake shoes having aninclosing casing either formed of cast metal or stamped from sheet-metal and a filling formed of frictional material pressed into thecasing.

4Friction-al vmaterials for brake shoes are familiar to those skilled inthe art and generally consist of a number of frictional materials suchas iron borings andV finely divided asbestos held together by means of abinder such as resin or resins and drying oils. It has been found inpractice that the outer or frictional surface of these composition brakeshoes have a much greater resist-y ance to wear than the inner portionsthereof.

It is my belief that the exposure of the outer surface to the action ofair in some manner seasons or ages the composition thereby giving to itits wear resisting qualities.

An object of this invention is to provide means whereby the entiremassof the frictional filler may be uniformly aged or cured so as to beuniformly wear resisting throughout.

For the purpose of illustrating this invention I have included a sheetof drawings in which Figure 1 is a view in sectional elevation of abrake shoe embodying this inven` tion, Fig. 2 is a top plan view of thesame,

and Fig. 3 is a cross sectional View taken ony through the interior ofthe casing and some only partially through. The filling material is theninserted 1n the casing and pressure exerted by means of a die andpress.A

Specification of Letters Patent.

Patented May 6, 1919.-

-Application lled January 10.1918. Serial No. 211,277.`

The die is preferably provided with holes registeringwith the lingerswhich extend entirely through the casing so that the'iller can becompressed around the fingers. Vv'hen the die is removed the casing withits filling may be lifted from the form and the liller will thus beprovided with perforations some of which extend entirely through theshoe while some extend only partially v'through from the back toward thefront.

In this `manner the filler is provided with air holes sothat air maycome in contact with the interior thereof and aid in aging or sea'soning the same.

The perforations in the back of the casing may be staggered as shown inFig. 2 or they nay be arranged in any manner found desira le.

The channels also allow the circulation of air in contact with the innerportion of the mass of the filler and this air serves to carry away theheat or a portion of the same geny erated during the application ofthebrake shoes. It is believedthat this heat has a tendency to soften thebinders usedvin. the filler material. By carrying away this heat theeffective lifeof thevbrake shoes is materially increased.

Having thus described I claim is- 1. In a brake shoe, an inclosing metalcase and a ller for said case formed of frictional. material containinga binding agent adapted my nvention what vtobe hardened by exposure tothe air, said material having channels extendinr there-- into for thepurpose of admitting alr to the interior of said material.

2. In a brake shoe, an inclosing metal case and a filling of frictionalmaterial held together by a binding agent adapted to be improved byexposure to the a1r; said filling material having air channels extendingthereinto from the back of said shoe.

3. In a brake shoe, an inclosing. erforated metal case, a filler offrictiona material within said casing and containing a binder adapted tobe improved by exposure to the air; said frictional material beingprovided with air channels registering with the perforations of saidcasing.

4. In a brake shoe, an inclosing metal case having perforations in theback thereof and a filler ofv frictional material provided with airchannels registering with said perforations and extending into saidfiller toward the front face thereof.

5. In a brake shoe, an inclosing metal easing having a. perforated backsection and 'a nels registering with the perforations of said backsection` and extending through said ller.

In testimonyy Whereofj I have hereunto 10 subscribed my name thisflthday of January, 1918.

MURRELL R. DE FRANCE.

